For the ultimate in night time comfort, this Thermofill Fresh duvet is the perfect choice. Featuring a pure cotton casing for superior comfort and softness, this sumptuous duvet is sure to help you gain the perfect night's sleep. Specially designed to benefit those that suffer from allergies, this anti-allergy duvet contains a special filling which incorporates an active ingredient helping to ensure a healthier and more comfortable sleeping environment. The All Seasons Duvet is made up of two duvets, a 4.5 tog for summer, and a 9.0 tog for autumn. These can be combined to create a snug 13.5 tog suitable for the colder winter nights.